Buggy code:
@ Value @ Builder public class PrintEdition implements Serializable { private static final long serialVersionUID = 1L ; private static final String ECONOMIST_COM = "economist.com" ; public static final int MIN_SECTION_COUNT = 5 ; public static final int MAX_SECTION_COUNT = 20 ; public static final int MIN_SEC_NAME_LEN = 4 ; public static final int MAX_SEC_NAME_LEN = 60 ; @ NonNull DateStamp dateStamp ; @ NonNull URI politicsThisWeek ; @ NonNull Optional < URI > businessThisWeek ; @ NonNull URI kalsCartoon ; @ NonNull URI letters ; @ NonNull URI obituary ; @ NonNull @ Size ( min = PrintEdition . MIN_SECTION_COUNT , max = PrintEdition . MAX_SECTION_COUNT ) Map < String , List < URI > > sections ; @ NonNull @ Size ( min = PrintEdition . MIN_SECTION_COUNT , max = PrintEdition . MAX_SECTION_COUNT ) @ EachLength ( min = PrintEdition . MIN_SEC_NAME_LEN , max = PrintEdition . MAX_SEC_NAME_LEN ) @ EachPattern ( regexp = PlainArticle . ECONOMIST_VISIBLE_TEXT ) List < String > orderedSections ; public PrintEdition validate ( ) throws ValidationException { INSTANCE . validate ( this , "print<seq2seq4repair_space>edition<seq2seq4repair_space>article<seq2seq4repair_space>list" ) ; if ( ! ( new HashSet < > ( orderedSections ) . equals ( sections . keySet ( ) ) ) ) throw new ValidationException ( ( ( ( ( "The<seq2seq4repair_space>ordered<seq2seq4repair_space>list<seq2seq4repair_space>of<seq2seq4repair_space>sections<seq2seq4repair_space>has<seq2seq4repair_space>" + ( new HashSet < > ( orderedSections ) . size ( ) ) ) + "<seq2seq4repair_space>distinct<seq2seq4repair_space>elements,<seq2seq4repair_space>but<seq2seq4repair_space>the<seq2seq4repair_space>map<seq2seq4repair_space>of<seq2seq4repair_space>sections<seq2seq4repair_space>to<seq2seq4repair_space>article-lists<seq2seq4repair_space>has<seq2seq4repair_space>just<seq2seq4repair_space>" ) + ( sections . size ( ) ) ) + "<seq2seq4repair_space>elements" ) ) ; for ( URI u : new URI [ ] { politicsThisWeek , businessThisWeek . orElse ( null ) , kalsCartoon , letters , obituary } ) if ( ( u != null ) && ( ! ( u . getHost ( ) . endsWith ( PrintEdition . ECONOMIST_COM ) ) ) ) throw new ValidationException ( "One<seq2seq4repair_space>of<seq2seq4repair_space>the<seq2seq4repair_space>following<seq2seq4repair_space>URLs<seq2seq4repair_space>points<seq2seq4repair_space>to<seq2seq4repair_space>a<seq2seq4repair_space>site<seq2seq4repair_space>other<seq2seq4repair_space>than<seq2seq4repair_space>the<seq2seq4repair_space>economist.com:<seq2seq4repair_space>Politics<seq2seq4repair_space>this<seq2seq4repair_space>Week,<seq2seq4repair_space>Business<seq2seq4repair_space>this<seq2seq4repair_space>Week,<seq2seq4repair_space>KAL's<seq2seq4repair_space>Cartoon,<seq2seq4repair_space>Letters<seq2seq4repair_space>and//or<seq2seq4repair_space>Obituary" ) ; for ( Map . Entry < String , List < URI > > articleList : sections . entrySet ( ) ) for ( URI article : articleList . getValue ( ) ) if ( ! ( article . getHost ( ) . endsWith ( PrintEdition . ECONOMIST_COM ) ) ) throw new ValidationException ( ( ( "One<seq2seq4repair_space>of<seq2seq4repair_space>the<seq2seq4repair_space>URLs<seq2seq4repair_space>in<seq2seq4repair_space>the<seq2seq4repair_space>" + ( articleList . getKey ( ) ) ) + "<seq2seq4repair_space>section<seq2seq4repair_space>points<seq2seq4repair_space>to<seq2seq4repair_space>a<seq2seq4repair_space>site<seq2seq4repair_space>other<seq2seq4repair_space>than<seq2seq4repair_space>the<seq2seq4repair_space>economist.com" ) ) ; if ( ( ! ( PrintEdition . isTheXmasIssue ( dateStamp . asLocalDate ( ) ) ) ) && ( ! ( PrintEdition . isThePostXmasIssue ( dateStamp . asLocalDate ( ) ) ) ) ) if ( ! ( businessThisWeek . isPresent ( ) ) ) <START_BUG> throw new ValidationException ( "The<seq2seq4repair_space>business<seq2seq4repair_space>this<seq2seq4repair_space>week<seq2seq4repair_space>section<seq2seq4repair_space>cannot<seq2seq4repair_space>be<seq2seq4repair_space>null,<seq2seq4repair_space>except<seq2seq4repair_space>for<seq2seq4repair_space>the<seq2seq4repair_space>Christmas<seq2seq4repair_space>issue" ) ; <END_BUG> return this ; } public static boolean isTheXmasIssue ( LocalDate dateStamp ) { } static boolean isThePostXmasIssue ( String dateStampText ) { } public static boolean isThePostXmasIssue ( LocalDate dateStamp ) { } }

Fix:
throw new ValidationException ( "The<seq2seq4repair_space>business<seq2seq4repair_space>this<seq2seq4repair_space>week<seq2seq4repair_space>section<seq2seq4repair_space>cannot<seq2seq4repair_space>be<seq2seq4repair_space>absent,<seq2seq4repair_space>except<seq2seq4repair_space>for<seq2seq4repair_space>the<seq2seq4repair_space>Christmas<seq2seq4repair_space>issue" ) ;